U.S. patent application number 16/061023 was filed with the patent office on 2018-12-13 for polycarbonate compositions containing polyglycidyl ether.
The applicant listed for this patent is Covestro Deutschland AG. Invention is credited to Anke BOUMANS, Helmut Werner HEUER, Rolf WEHRMANN.
Application Number | 20180355167 16/061023 |
Document ID | / |
Family ID | 55066310 |
Filed Date | 2018-12-13 |
United States Patent
Application |
20180355167 |
Kind Code |
A1 |
WEHRMANN; Rolf ; et
al. |
December 13, 2018 |
POLYCARBONATE COMPOSITIONS CONTAINING POLYGLYCIDYL ETHER
Abstract
The invention relates to polycarbonate compositions having high
flowability and good thermal properties, comprising specific
glycidyl ether compounds and typically at least one additive from
the group of the thermal stabilizers, UV stabilizers and/or
demoulding agents, and to mouldings made from these compositions.
The polycarbonate compositions have high flowability and good
thermal properties. The invention also relates to the improvement
in the flowability of polycarbonate melts.
Inventors: |
WEHRMANN; Rolf; (Krefeld,
DE) ; HEUER; Helmut Werner; (Siegen, DE) ;
BOUMANS; Anke; (Goch, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Covestro Deutschland AG |
Leverkusen |
|
DE |
|
|
Family ID: |
55066310 |
Appl. No.: |
16/061023 |
Filed: |
December 8, 2016 |
PCT Filed: |
December 8, 2016 |
PCT NO: |
PCT/EP2016/080287 |
371 Date: |
June 11, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C08K 5/1515 20130101;
C08L 69/00 20130101; C08K 5/1515 20130101; C08L 69/00 20130101;
C08L 69/00 20130101; C08L 63/00 20130101; C08L 69/00 20130101; C08L
69/00 20130101; C08K 5/1515 20130101; C08L 69/00 20130101 |
International
Class: |
C08L 69/00 20060101
C08L069/00; C08K 5/1515 20060101 C08K005/1515 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 11, 2015 |
EP |
15199615.4 |
Claims
1.-11. (canceled)
12. A composition comprising A) 64.0-99.94 wt % of aromatic
polycarbonate and B) 0.05 to 3.0 wt % of at least one polyglycidyl
ether compound of the formula (1) ##STR00008## in which R.sub.4 is
a C.sub.1- to C.sub.8-alkyl group or an aryl group, where the alkyl
group is branched or unbranched, and R.sub.11 to R.sub.13 are the
same or different and are H, C.sub.1- to C.sub.8-alkyl radicals or
aryl radicals, where the alkyl radicals are branched or
unbranched.
13. The composition according to claim 12, wherein the amount of
the polyglycidyl ether compound is 0.1 to 0.6 wt %.
14. The composition according to claim 12, wherein the polyglycidyl
ether compound of the formula (1) present, alone or in a mixture
with other polyglycidyl ethers of the formula (1), is the
trisglycidyl ether of 1,1,1-tris(p-hydroxyphenyl)ethane of the
formula (2) ##STR00009##
15. The composition according to claim 12, further comprising 0.001
wt % to 3 wt % of at least one additive from the group of the
thermal stabilizers, UV stabilizers and/or demoulding agents
(component C).
16. The composition according to claim 12, consisting of the
following components: A) 64.0-99.94 wt % of aromatic polycarbonate,
B) 0.05 to 3.0 wt % of polyglycidyl ether of the formula (1) C)
0.001 wt % to 3 wt % of at least one additive selected from the
groups of the thermal stabilizers, UV stabilizers and demoulding
agents, and D) 0.0 wt % to 30.0 wt % of one or more further
additives selected from the groups of the flame retardants, IR
absorbers, antistats and inorganic fillers.
17. A moulding produced from the composition according to claim
12.
18. The moulding according to claim 17, wherein the moulding has a
thickness of 0.1 to 3 mm.
19. The moulding according to claim 18, wherein the moulding has a
thickness of 0.1 to 2 mm.
20. Moulding according to claim 19, wherein the moulding has a
thickness of 0.1 to 1.0 mm.
21. A method comprising utilizing at least one polyglycidyl ether
compound of the formula (1) ##STR00010## in which R.sub.4 is a
C.sub.1- to C.sub.8-alkyl group or an aryl group, where the alkyl
group is branched or unbranched, and R.sub.11 to R.sub.13 are the
same or different and are H, C.sub.1- to C.sub.8-alkyl radicals or
aryl radicals, where the alkyl radicals are branched or unbranched,
for increasing the melt volume flow rate, determined according to
ISO 1133-1:2011-12 at 300.degree. C. with a 1.2 kg load, of a
polycarbonate composition.
22. The method according to claim 21, wherein the polyglycidyl
ether compound of the formula (1) present, alone or in a mixture
with other polyglycidyl ethers of the formula (1), is the
trisglycidyl ether of 1,1,1-tris(p-hydroxyphenyl)ethane of the
formula (2) ##STR00011##
Description
[0001] The present invention relates to polycarbonate compositions
comprising specific glycidyl ether compounds and typically at least
one additive from the group of the thermal stabilizers, UV
stabilizers and/or demoulding agents, and to mouldings produced
from these compositions. The polycarbonate compositions have high
flowability and good thermal properties. The invention also relates
to the improvement in the flowability of polycarbonate melts.
[0002] The flowability of (co)polycarbonate compositions or
(co)polycarbonate blends can be increased by the addition of low
molecular weight compounds. Since substances of this kind, however,
simultaneously act as plasticizers, they lower the heat distortion
resistance and glass transition temperature of the polymer matrix.
This in turn is undesirable, since this reduces the temperature use
range of the materials.
[0003] DE 102004020673 A1 describes copolycarbonates having
improved flowability, based on bisphenols having an ether or
thioether linkage.
[0004] DE 3918406 A1 discloses blends for optical data storage
means, based on a specific polycarbonate with elastomers or other
thermoplastics, and the use thereof in optical applications,
specifically optical data storage means such as compact discs.
[0005] EP 0 953 605 A2 describes linear polycarbonate compositions
having improved flow characteristics, characterized in that cyclic
oligocarbonates are added in large amounts, for example 0.5% to 4%,
and are homogenized in the matrix of a linear BPA polycarbonate at
285.degree. C. by means of a twin-shaft extruder. In the course of
this, the flowability increases as the amount of cyclic
oligocarbonates rises. At the same time, however, there is a
distinct decrease in the glass transition temperature and hence the
heat distortion resistance. This is undesirable in the industrial
applications of (co)polycarbonate compositions having relatively
high heat distortion resistance. This disadvantage then has to be
compensated for through the use of higher amounts of costly
co-bisphenols.
[0006] It was thus an object of the present invention to provide
polycarbonate compositions having high flowability and very
substantially unchanged thermal and mechanical properties (e.g.
glass transition temperature), without having the disadvantages of
the compositions known from the prior art, for example inadequate
flow characteristics in processing. At the same time, the
polycarbonate compositions according to the invention should have
good melt stabilities, which is important for the production of
extruded or injection moulded parts in a production process.
[0007] Surprisingly, it has now been found that this object is
achieved by a composition comprising [0008] A) 64.0 wt % to 99.94
wt % of aromatic polycarbonate, and [0009] B) 0.05 to 3.0 wt % of
at least one polyglycidyl ether compound of the formula (I)
[0009] ##STR00001## [0010] in which R.sub.4 is a C.sub.1- to
C.sub.8-alkyl group or an aryl group, where the alkyl group is
branched or unbranched, and [0011] R.sub.11 to R.sub.13 are the
same or different and are H, C.sub.1- to C.sub.8-alkyl radicals or
aryl radicals, where the alkyl radicals are branched or
unbranched.
[0012] The object is additionally achieved by mouldings produced
from such a composition.
[0013] The compositions according to the invention feature good
mechanical properties, especially good impact resistance,
determined according to ISO 180/IC:2000-12, and very good
rheological characteristics, i.e. high flowability, expressed by
the melt volume flow rate MVR, determined according to ISO
1133-1:2011-12. At the same time, melt stability is high.
[0014] Preferably, the compositions according to the invention
further include 0.001 wt % to 3 wt % of at least one additive from
the group of the thermal stabilizers, UV stabilizers and/or
demoulding agents (component C).
[0015] The compositions according to the invention may also contain
up to 30.0 wt %, preferably 0.10 to 25 wt %, more preferably 0.2 to
20 wt %, of other customary additives ("further additives",
component D). These further additives do not form part of the
groups of the thermal stabilizers, UV stabilizers and demoulding
agents. Examples of component D are flame retardants, IR absorbers,
antistats and inorganic fillers such as glass fibres, carbon
fibres, titanium dioxide, silicates, barium sulphate and talc.
[0016] Very particularly preferred composition do not contain any
further components aside from components A) to D).
[0017] The individual constituents of the compositions according to
the invention are more particularly elucidated hereinbelow:
Definitions
[0018] C.sub.1- to C.sub.8-Alkyl, branched or unbranched, is
understood in the context of the invention to mean an alkyl group
having 1 to 8 carbon atoms. C.sub.1- to C.sub.4-Alkyl is, for
example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl,
tert-butyl, C.sub.1- to C.sub.6-alkyl is additionally, for example,
n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, neopentyl,
1-ethylpropyl, n-hexyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl,
1,3-dimethylpropyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl,
4-methylpentyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl,
1,3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl,
3,3-dimethylbutyl, 1-ethylbutyl, 2-ethylbutyl,
1,1,2-trimethylpropyl, 1,2,2-trimethylpropyl,
1-ethyl-1-methylpropyl, I-ethyl-2-methylpropyl or
1-ethyl-3-methylpropyl, and C.sub.1- to C.sub.8-alkyl is
additionally, for example, n-heptyl or n-octyl. The same applies to
the corresponding alkyl radical in aralkyl radicals.
[0019] Aryl is a carbocyclic aromatic radical having 6 to 34
skeleton carbon atoms. Preferred examples of C.sub.6- to
C.sub.24-aryl include phenyl, o-, p-, m-tolyl, naphthyl,
phenanthrenyl, anthracenyl and fluorenyl. Arylene is an aryl as
defined above having two bonds. The same applies to the aromatic
moiety of an arylalkyl radical, also called aralkyl radical.
[0020] The above lists are illustrative and should not be regarded
as limiting.
[0021] In the context of the present invention, ppb and ppm are
understood to mean parts by weight unless stated otherwise.
[0022] In the context of the present invention, the stated
percentages by weight of components A and B and of the optionally
present components C and D--unless explicitly stated otherwise--are
each based on the total weight of the composition. The composition
may contain further components as well as components A and B and
the optionally present components C and D. In a preferred
embodiment, the composition consists of components A, B, C and D;
in other words, components A, B, C and D add up to 100% by
weight.
[0023] Component A
[0024] Polycarbonates in the context of the present invention are
both homopolycarbonates and copolycarbonates. The polycarbonates
may be linear or branched in known fashion.
[0025] According to the invention, it is also possible to use
mixtures of polycarbonates.
[0026] The polycarbonates have mean molecular weights M.sub.w
(determined by measuring the relative viscosity at 25.degree. C. in
CH.sub.2Cl.sub.2 and a concentration of 0.5 g per 100 ml of
CH.sub.2Cl.sub.2) of preferably 15 000 g/mol to 36 000 g/mol, more
preferably of 16 000 g/mol to 35 000 g/mol, especially of 17 000
g/mol to 34 000 g/mol, determined by bisphenol A polycarbonate
calibration.
[0027] The polycarbonates are prepared in a known manner from
dihydroxyaryl compounds, carbonic acid derivatives, and optionally
chain terminators and branching agents.
[0028] Particulars pertaining to the preparation of polycarbonates
are disclosed in many patent documents spanning approximately the
last 40 years. Reference may be made here to Schnell, "Chemistry
and Physics of Polycarbonates", Polymer Reviews, Volume 9,
Interscience Publishers, New York, London, Sydney 1964, to D.
Freitag, U. Grigo, P. R. Muller, H. Nouvertne, BAYER AG,
"Polycarbonates" in Encyclopedia of Polymer Science and
Engineering, Volume II, Second Edition, 1988, pages 648-718 and
finally to U. Grigo, K. Kirchner and P. R. Muller "Polycarbonate"
[Polycarbonates] in Becker/Braun, Kunststoff-Handbuch [Plastics
Handbook], volume 3/1, Polycarbonate, Polyacetale, Polyester,
Celluloseester [Polycarbonates, Polyacetals, Polyesters, Cellulose
Esters], Carl Hanser Verlag Munich, Vienna 1992, pages 117-299.
[0029] Aromatic polycarbonates are prepared, for example, by
reaction of dihydroxyaryl compounds with carbonyl halides,
preferably phosgene, and/or with aromatic dicarbonyl dihalides,
preferably benzenedicarbonyl dihalides, by the interfacial process,
optionally with use of chain terminators and optionally with use of
trifunctional or more than trifunctional branching agents.
Preparation via a melt polymerization process by reaction of
dihydroxyaryl compounds with, for example, diphenyl carbonate is
likewise possible.
[0030] Dihydroxyaryl compounds suitable for the production of
polycarbonates are for example hydroquinone, resorcinol,
dihydroxydiphenyls, bis(hydroxyphenyl)alkanes,
bis(hydroxyphenyl)cycloalkanes, bis(hydroxyphenyl) sulphides,
bis(hydroxyphenyl) ethers, bis(hydroxyphenyl) ketones,
bis(hydroxyphenyl) sulphones, bis(hydroxyphenyl) sulphoxides,
.alpha.,.alpha.'-bis(hydroxyphenyl)diisopropylbenzenes,
phthalimidines derived from derivatives of isatin or
phenolphthalein and the ring-alkylated, ring-arylated and
ring-halogenated compounds thereof.
[0031] Preferred dihydroxyaryl compounds are
4,4'-dihydroxydiphenyl, 2,2-bis(4-hydroxyphenyl)propane (bisphenol
A), 2,4-bis(4-hydroxyphenyl)-2-methylbutane,
1,1-bis(4-hydroxyphenyl)-p-diisopropylbenzene,
2,2-bis(3-methyl-4-hydroxyphenyl)propane,
2,2-bis(3-methyl-4-hydroxyphenyl)propane,
bis(3,5-dimethyl-4-hydroxyphenyl)methane,
2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane,
bis(3,5-dimethyl-4-hydroxyphenyl)sulphone,
2,4-bis(3,5-dimethyl-4-hydroxyphenyl)-2-methylbutane,
1,1-bis(3,5-dimethyl-4-hydroxyphenyl)-p-diisopropylbenzene and
1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, and bisphenols
(I) to (III)
##STR00002## [0032] in which R' in each case is C.sub.1- to
C.sub.4-alkyl, aralkyl or aryl, preferably methyl or phenyl, most
preferably methyl.
[0033] Particularly preferred dihydroxyaryl compounds are
2,2-bis(4-hydroxyphenyl)propane (bisphenol A),
2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane,
1,1-bis(4-hydroxyphenyl)cyclohexane,
1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and
2,2-bis(3-methyl-4-hydroxyphenyl)propane, and the dihydroxyaryl
compounds of the formulae (I), (II) and (III).
[0034] These and other suitable dihydroxyaryl compounds are
described for example in U.S. Pat. No. 3,028,635, U.S. Pat. No.
2,999,825, U.S. Pat. No. 3,148,172, U.S. Pat. No. 2,991,273, U.S.
Pat. No. 3,271,367, U.S. Pat. No. 4,982,014 and U.S. Pat. No.
2,999,846, in DE-A 1 570 703, DE-A 2 063 050, DE-A 2 036 052, DE-A
2 211 956 and DE-A 3 832 396, in FR-A 1 561 518, in the monograph
H. Schnell, "Chemistry and Physics of Polycarbonates", Interscience
Publishers, New York 1964.
[0035] In the case of homopolycarbonates only one dihydroxyaryl
compound is used; in the case of copolycarbonates two or more
dihydroxyaryl compounds are used.
[0036] Examples of suitable carbonic acid derivatives include
phosgene or diphenyl carbonate.
[0037] Suitable chain terminators that may be used in the
production of polycarbonates are monophenols. Suitable monophenols
are for example phenol itself, alkylphenols such as cresols,
p-tert-butylphenol, cumylphenol and mixtures thereof.
[0038] Preferred chain terminators are the phenols mono- or
polysubstituted by linear or branched C.sub.1- to C.sub.30-alkyl
radicals, preferably unsubstituted or substituted by tert-butyl.
Particularly preferred chain terminators are phenol, cumylphenol
and/or p-tert-butylphenol.
[0039] The amount of chain terminator to be used is preferably 0.1
to 5 mol %, based on moles of dihydroxyaryl compounds used in each
case. The chain terminators can be added before, during or after
the reaction with a carbonic acid derivative.
[0040] Suitable branching agents are the trifunctional or more than
trifunctional compounds familiar in polycarbonate chemistry, in
particular those having three or more than three phenolic OH
groups.
[0041] Examples of suitable branching agents include
1,3,5-tri(4-hydroxyphenyl)benzene,
1,1,1-tri(4-hydroxyphenyl)ethane,
tri(4-hydroxyphenyl)phenylmethane,
2,4-bis(4-hydroxyphenylisopropyl)phenol,
2,6-bis(2-hydroxy-5'-methylbenzyl)-4-methylphenol,
2-(4-hydroxyphenyl)-2-(2,4-dihydroxyphenyl)propane,
tetra(4-hydroxyphenyl)methane,
tetra(4-(4-hydroxyphenylisopropyl)phenoxy)methane and
1,4-bis((4',4''-dihydroxytriphenyl)methyl)benzene and
3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole.
[0042] The amount of the branching agents for optional employment
is preferably 0.05 mol % to 2.00 mol %, based on moles of
dihydroxyaryl compounds used in each case.
[0043] The branching agents can either be initially charged
together with the dihydroxyaryl compounds and the chain terminators
in the aqueous alkaline phase or added dissolved in an organic
solvent before the phosgenation. In the case of the
transesterification process the branching agents are used together
with the dihydroxyaryl compounds.
[0044] Particularly preferred polycarbonates are the
homopolycarbonate based on bisphenol A, the homopolycarbonate based
on 1,3-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and the
copolycarbonates based on the two monomers bisphenol A and
1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, and homo- or
copolycarbonates derived from the dihydroxyaryl compounds of the
formulae (I) to (III)
##STR00003## [0045] in which R' in each case is C.sub.1- to
C.sub.4-alkyl, aralkyl or aryl, preferably methyl or phenyl, most
preferably methyl,
[0046] preferably with bisphenol A as comonomer.
[0047] To facilitate incorporation of additives component A is
preferably employed in the form of powders, pellets or mixtures of
powders and pellets.
[0048] Compositions according to the invention contain 64.0 to
99.94 wt %, preferably 70.0 to 99.94 wt %, more preferably 80.0 to
99.90 wt %, most preferably to 79.949 wt %, of at least one
aromatic polycarbonate.
[0049] Component B
[0050] The polyglycidyl ether compounds of component B are those of
the general formula (I)
##STR00004##
[0051] in which R.sub.4 is a C.sub.1- to C.sub.8-alkyl group or an
aryl group, where the alkyl group is branched or unbranched,
and
[0052] R.sub.11 to R.sub.13 are the same or different and are H,
C.sub.1- to C.sub.8-alkyl radicals or aryl radicals, where the
alkyl radicals are branched or unbranched.
[0053] A most preferred polyglycidyl ether present alone or in a
mixture with other polyglycidyl ethers of the formula (I) in
compositions according to the invention is a polyglycidyl ether of
the formula (2) (THPE trisglycidyl ether, trisglycidyl ether of
1,1,1-tris(p-hydroxyphenyl)ethane):
##STR00005##
[0054] Compositions according to the invention contain 0.05 to 3.0
wt %, preferably 0.1 to 2.0 wt %, more preferably 0.2 to 1.5 wt %
and most preferably 0.3 to 0.8 wt % of at least one polyglycidyl
ether compound of the formula (I).
[0055] Component C
[0056] Preferably, the compositions according to the invention
further comprise at least one of the additives of thermal
stabilizer, UV stabilizer and/or demoulding agent in a total amount
of 0.001 wt % to 3 wt %.
[0057] Preferentially suitable thermal stabilizers are
triphenylphosphine, tris(2,4-di-tert-butylphenyl) phosphite
(Irgafos.RTM. 168),
tetrakis(2,4-di-tert-butylphenyl)-[1,1-biphenyl]-4,4'-diyl
bisphosphonite, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)
propionate (Irganox.RTM. 1076),
bis(2,4-dicumylphenyl)pentaerythritol diphosphite (Doverphos.RTM.
S-9228), bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol
diphosphite (ADK STAB PEP-36). These or other thermal stabilizers
are used alone or in a mixture (for example Irganox.RTM. B900
(mixture of Irgafos.RTM. 168 and Irganox.RTM. 1076 in a 1:3 ratio)
or Doverphos.RTM. S-92228 with Irganox.RTM. B900 or Irganox.RTM.
1076). The thermal stabilizers are used alone or in a mixture,
preferably in amounts of 0.003 to 0.2 wt %. UV absorbers used are
those compounds which have minimum transmittance below 400 nm and
maximum transmittance above 400 nm. Ultraviolet absorbers
particularly suitable for use in the composition according to the
invention are benzotriazoles, triazines, benzophenones and/or
arylated cyanoacrylates.
[0058] Particularly suitable ultraviolet absorbers are
hydroxybenzotriazoles, such as
2-(3',5'-bis(1,1-dimethylbenzyl)-2'-hydroxyphenyl)benzotriazole
(Tinuvin.RTM. 234, BASF, Ludwigshafen),
2-(2'-hydroxy-5'-(tert-octyl)phenyl)benzotriazole (Tinuvin.RTM.
329, BASF, Ludwigshafen),
bis(3-(2H-benzotriazolyl)-2-hydroxy-5-tert-octyl)methane
(Tinuvin.RTM. 360, BASF, Ludwigshafen),
2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-(hexyloxy)phenol
(Tinuvin.RTM.1577, BASF, Ludwigshafen), and also benzophenones such
as 2,4-dihydroxybenzophenone (Chimassorb.RTM. 22, BASF,
Ludwigshafen) and 2-hydroxy-4-(octyloxy)benzophenone
(Chimassorb.RTM. 81, BASF, Ludwigshafen),
2,2-bis[[(2-cyano-1-oxo-3,3-diphenyl-2-propenyl)oxy]methyl]-1,3-propanedi-
yl ester (9CI) (Uvinul.RTM. 3030, BASF AG Ludwigshafen),
2-[2-hydroxy-4-(2-ethylhexyl)oxy]phenyl-4,6-di(4-phenyl)phenyl-1,3,5-tria-
zine (Tinuvin.RTM. 1600, BASF, Ludwigshafen), tetraethyl
2,2'-(1,4-phenylenedimethylidene)bismalonate (Hostavin.RTM. B-Cap,
Clariant AG) or N-(2-ethoxyphenyl)-N'-(2-ethylphenyl)ethanediamide
(Tinuvin.RTM. 312, BASF, Ludwigshafen).
[0059] Particularly preferred UV stabilizers are
bis(3-(2H-benzotriazolyl)-2-hydroxy-5-tert-octyl)methane
(Tinuvin.RTM. 360),
2-(2'-hydroxy-5'-(tert-octyl)phenyl)benzotriazole (Tinuvin.RTM.
329) and N-(2-ethoxyphenyl)-N'-(2-ethylphenyl)ethanediamide
(Tinuvin.RTM. 312), very particular preference being given to
bis(3-(2H-benzotriazolyl)-2-hydroxy-5-tert-octyl)methane
(Tinuvin.RTM. 360),
2-(2'-hydroxy-5'-(tert-octyl)phenyl)benzotriazole (Tinuvin.RTM.
329).
[0060] It is also possible to use mixtures of these ultraviolet
absorbers.
[0061] If the compositions according to the invention contain UV
absorbers, the amount of UV absorber is preferably not more than
0.8 wt %, more preferably 0.05 wt % to 0.5 wt %, most preferably
0.1 wt % to 0.4 wt %, based on the overall composition.
[0062] Any demoulding agents added to the compositions according to
the invention are preferably selected from the group consisting of
pentaerythritol tetrastearate, glycerol monostearate and long-chain
fatty acid esters, for example stearyl stearate and propanediol
stearate, and mixtures thereof. The demoulding agents are
preferably used in amounts of 0.05 wt % to 2.00 wt %, preferably in
amounts of 0.1 wt % to 1.0 wt %, more preferably in amounts of 0.15
wt % to 0.60 wt % and most preferably in amounts of 0.20 wt % to
0.50 wt %, based on the overall composition.
[0063] More preferably, at least one thermal stabilizer and
optionally a demoulding agent is present as component C.
[0064] Preferred compositions do not contain any components other
than components A to C.
[0065] Component D
[0066] Optionally present as an alternative are up to 30.0 wt %,
preferably 0.10 to 25 wt %, more preferably 0.2 to 20 wt %, of
other customary additives ("further additives", component D). These
further additives do not form part of the groups of the thermal
stabilizers, UV stabilizers and demoulding agents. In this
embodiment, the compositions according to the invention preferably
consist of components A, B, C and D. Examples of component D are
flame retardants, IR absorbers, antistats, transesterification
stabilizers such as trisisooctyl phosphate, and inorganic fillers
such as glass fibres, carbon fibres, titanium dioxide, silicates,
barium sulphate and talc.
[0067] Such additives, as customarily added to polycarbonates, are
especially the antioxidants, IR absorbers, antistats, flame
retardants, anti-dripping agents, optical brighteners,
light-scattering agents, colourants such as pigments, including
inorganic pigments, carbon black and/or dyes, and inorganic fillers
such as titanium dioxide or barium sulphate that are described in
EP-A 0 839 623, WO-A 96/15102, EP-A 0 500 496 or "Plastics
Additives Handbook", Hans Zweifel, 5th Edition 2000, Hanser Verlag,
Munich, in the amounts customary for polycarbonate. These additives
may be added singly or else as mixtures.
[0068] The polymer compositions according to the invention,
comprising components A to C and optionally D, are produced by
standard incorporation processes via combination, mixing and
homogenization of the individual constituents, especially with the
homogenization preferably taking place in the melt under the action
of shear forces. Combination and mixing is optionally effected
prior to melt homogenization using powder premixes.
[0069] It is also possible to use premixes of pellets, or of
pellets and powders, with components B to C and optionally D.
[0070] It is also possible to use premixes which have been produced
from solutions of the mixture components in suitable solvents, in
which case homogenization is optionally effected in solution and
the solvent is then removed.
[0071] In particular, components B to C and optionally D of the
composition according to the invention may be introduced into the
polycarbonate here by known processes or in the form of a
masterbatch.
[0072] The use of masterbatches to incorporate components B to C
and optionally D--singly or as mixtures--is preferable.
[0073] In this context, the composition according to the invention
can be combined, mixed, homogenized and subsequently extruded in
customary apparatus such as screw extruders (ZSK twin-screw
extruders for example), kneaders or Brabender or Banbury mills.
After extrusion, the extrudate may be chilled and comminuted. It is
also possible to premix individual components and then to add the
remaining starting materials individually and/or likewise in a
mixture.
[0074] It is also possible to combine and mix a premix in the melt
in the plastifying unit of an injection-moulding machine. In this
case, the melt is converted directly to a shaped body in the
subsequent step.
[0075] The plastics mouldings are preferably produced by injection
moulding.
[0076] Compositions according to the invention are suitable for
producing multilayer systems. This involves application of the
polycarbonate composition according to the invention in one or more
layer(s) to a moulded article made from a plastic. Application may
be carried out at the same time as or immediately after the
moulding of the shaped body, for example by foil insert moulding,
coextrusion or multicomponent injection moulding. However,
application may also be to the ready-moulded main body, for example
by lamination with a film, by encapsulative overmoulding of an
existing shaped body or by coating from a solution.
[0077] Compositions according to the invention are suitable for
production of framework components in the electrics and electronics
sector and IT sector, especially for applications which place high
demands on flame retardancy. Such applications include, for
example, screens or housings, for instance for ultrabooks or frames
for LED display technologies, e.g. OLED displays or LCD displays or
else for E-ink devices. Further applications are housing parts of
mobile communication terminals, such as smartphones, tablets,
ultrabooks, notebooks or laptops, but also of navigation devices,
smartwatches or heart rate meters, and also for electrical
applications in thin-walled designs, for example home and
industrial networking systems and smart meter housing
components.
[0078] Compositions according to the invention are particularly
suitable for production of thin-walled mouldings of thickness 0.1
to 3 mm, preferably 0.1 to 2 mm, more preferably 0.1 to 1.0 mm, for
the electrics/electronics sector or the IT sector with a UL-94 V-0
flammability class with wall thickness 1.5 mm. The thickness
figures in this case do not mean that the moulding has such a
thickness within the stated range at every point. Instead, the
thicknesses stated relate to the part of the moulding with the
lowest wall thickness.
[0079] The invention further provides for the use of at least one
polyglycidyl ether compound of the formula (I) (component B)
##STR00006## [0080] in which R.sub.4 is a C.sub.1- to C.sub.8-alkyl
group or an aryl group, where the alkyl group is branched or
unbranched, and [0081] R.sub.11 to R.sub.13 are the same or
different and are H, C.sub.1- to C.sub.8-alkyl radicals or aryl
radicals, where the alkyl radicals are branched or unbranched,
[0082] preferably of
##STR00007##
[0083] for increasing the melt volume flow rate, determined
according to ISO 1133-1:2011-12 at 300.degree. C. with a load of
1.2 kg, of a polycarbonate composition comprising component A,
optionally component C and optionally component D. The ranges of
preference for components A to C and the optionally present
component D that have been mentioned in connection with the
polycarbonate composition according to the invention likewise apply
to the use according to the invention.
EXAMPLES
[0084] The polycarbonate compositions described hereinafter were
produced by compounding in a Berstorff ZE 25 extruder with a
throughput of 5 kg/h and a screw rotation frequency of 50/min. The
shaped bodies were produced in an Arburg Allrounder 370 C injection
moulding machine at 280.degree. C.
[0085] Component A-1: Thermally stabilized linear polycarbonate
based on bisphenol A having a melt volume flow rate MVR of 12.5
cm.sup.3/10 min (as per ISO 1133-1:2011-12, at a test temperature
of 300.degree. C. with a load of 1.2 kg). Component A-1 contains
0.025 wt % of triphenylphosphine (component C) as thermal
stabilizer.
[0086] Component A-2: Linear polycarbonate powder based on
bisphenol A having a melt volume flow rate MVR of 6 cm.sup.3/10 min
(as per ISO 1133-1:2011-12, at a test temperature of 300.degree. C.
with a load of 1.2 kg).
[0087] Component B: Trisglycidyl ether of
1,1,1-tris(p-hydroxyphenyl)ethane from Excel Industries Ltd.,
India.
[0088] Impact resistance was measured at room temperature in
accordance with ISO 180/IC:2000-12 on test specimens measuring 80
mm.times.10 mm.times.4 mm.
[0089] Glass transition temperature was determined by means of DSC
(2nd heating).
[0090] Melt volume flow rate (MVR) was determined in accordance
with ISO 1133-1:2011-12 (at a test temperature of 300.degree. C.,
mass 1.2 kg) using a Zwick 4106 instrument from Zwick Roell.
[0091] Melt viscosities were determined in accordance with ISO
11443:2014-04 (cone-plate arrangement).
[0092] 2. Compositions
[0093] Table 1a: Inventive compositions 4-6 comprising polyglycidyl
ether, and comparative examples 1C-3C
[0094] IC is the thermally stabilized polycarbonate raw material
used.
[0095] 2C is the re-extruded 1C; this simulates the compounding
step for inventive examples 4-6.
TABLE-US-00001 TABLE 1a Inventive compositions 4-6 comprising
polyglycidyl ether, and comparative examples 1C-3C 1C 2C
Formulation Pellets Re-ex 3C 4 5 6 Component A-1.sup.1) wt % 100
100 93 93 93 93 Component A-2 wt % 7 6.9 6.7 6.4 Component B wt %
0.1 0.3 0.6 .sup.1)contains triphenylphosphine as component C;
TABLE-US-00002 TABLE 1b Glass transition temperatures, rheological
properties and impact resistances of inventive compositions 4-6
comprising polyglycidyl ether, and of comparative examples 1C-3C 1C
2C Results Pellets Re-ex 3C 4 5 6 T.sub.G .degree. C. 148.1 145.1
147.8 147.8 147.1 145.0 MVR cm.sup.3/ 12.1 12.1 11.6 13.6 16.0 16.6
300.degree. C./1.2 kg 10 min IMVR20' cm.sup.3/ 12.1 12.4 12.0 14.3
16.0 17.2 300.degree. C./1.2 kg 10 min Delta 0.0 -0.3 -0.4 -0.7 0.0
-0.6 MVR/IMVR20' Melt visc. at 280.degree. C. eta 50 Pa s 688 651
735 488 468 eta 100 Pa s 668 633 672 461 457 456 eta 200 Pa s 619
596 630 446 438 441 eta 500 Pa s 515 499 521 374 383 384 eta 1000
Pa s 397 391 403 317 312 314 eta 1500 Pa s 325 321 330 267 264 265
eta 5000 Pa s 152 151 155 132 131 131 Melt visc. at 300.degree. C.
eta 50 Pa s 373 375 404 279 238 eta 100 Pa s 370 368 389 277 237
eta 200 Pa s 356 353 369 274 236 244 eta 500 Pa s 314 312 322 246
217 226 eta 1000 Pa s 263 261 268 217 191 198 eta 500 Pa s 226 225
235 192 171 176 eta 5000 Pa s 119 119 120 108 98 100 Melt visc. at
320.degree. C. eta 100 Pa s 203 198 202 141 eta 200 Pa s 202 195
199 154 139 138 eta 500 Pa s 190 184 185 149 137 133 eta 1000 Pa s
170 164 167 138 127 123 eta 1500 Pa s 154 149 152 127 118 114 eta
5000 Pa s 93 90 92 81 77 75 Melt visc. at 340.degree. C. eta 200 Pa
s 123 103 108 89 83 76 eta 500 Pa s 119 101 106 87 82 75 eta 1000
Pa s 111 95 99 84 79 72 eta 1500 Pa s 104 88 92 80 75 69 eta 5000
Pa s 70 62 64 59 60 52 Impact resistance kJ/m.sup.2 7 .times. n.f.
n.f. n.f. n.f. n.f. n.f. ISO180/1.degree. C. 3 .times. 243s n.f.:
no fracture (no value, since no fracture)
[0096] It is apparent from the table that the compositions
according to the comparative examples that do not contain any
polyglycidyl ether have a much poorer melt volume flow rate MVR.
The flow curves of the compositions according to the invention each
show distinctly reduced melt viscosities over the entire shear
range at different measurement temperatures, which means improved
flowability. The effects on glass transition temperature are
insignificant in this case. Impact resistance is unchanged and
good.
* * * * *